The Design of Fused Amine/Carbonyl System for Efficient Thermally Activated Delayed Fluorescence: Novel Multiple Resonance Core and Electron Acceptor

Yi Yuan, Xun Tang, Xiao Yang Du, Yun Hu, You Jun Yu, Zuo Quan Jiang, Liang Sheng Liao, Shuit Tong Lee

Research output: Contribution to journalArticlepeer-review

121 Citations (Scopus)

Abstract

Multiple resonances induced thermally activated delayed fluorescence (MR-TADF) has great advantages in high color purity display. Up to now, current MR-TADF emitters are only based on the boron-nitrogen-containing fragment. Reported herein is a novel class of MR-TADF emitter, quinolino[3,2,1-de]acridine-5,9-dione (QAO), realized by the opposite resonance effect of the carbonyl and the nitrogen atoms, which is also the smallest TADF emitter reported so far. The QAO-based pure blue organic light-emitting diode achieves a maximum external quantum efficiency (EQE max ) of 19.4% with a small full width at half maximum of 39 nm. Moreover, tert-butyl modified QAO can be employed as an efficient electron acceptor to construct an efficient yellow-green evaporation and solution process feasible TADF emitter, 7-(tert-butyl)-3,11-bis(9,9-dimethylacridin-10(9H)-yl)quinolino[3,2,1-de]acridine-5,9-dione (QAO-DAd), with significantly improved performance as compared to the previous flexible diketone-based emitters.

Original languageEnglish
Article number1801536
JournalAdvanced Optical Materials
Volume7
Issue number7
DOIs
Publication statusPublished - Apr 4 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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